found this pretty useful :
http://research.microsoft.com/en-us/um/people/jckrumm/Publications%202010/lane_structure_ACM-GIS2010.pdf

On Fri, Apr 6, 2012 at 5:38 PM, Rossko <[email protected]> wrote:
>> Example, if ten people draw the outline of a city, the algorithm
>> should be able to combine all ten and give a single boundary as the
>> result.
>
> I think if you search for "crowdsourced" rather than clustered
> polygons, you will get more clues.  One approach is to use a scoring
> system on the vertices.
>
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